crankcase and engine

Abstract

The invention provides a crankshaft box and a motor. The crankshaft box comprises a box body; a main bearing stop push bar and assistant bearing stop push bars positioned at two sides of the main bearing stop push bar are arranged at the inner wall of the box body; the side surface of the main bearing sop push bar is provided with a first curved surface for still ensuring the gap between the crankshaft box and the crankshaft after a stop push piece is worn; the side surface of each assistant bearing stop push bar is provided with a second curved surface for still ensuring the gap between the crankshaft box and the crankshaft after the stop push piece is worn. During braking, when a clutch poking fork pushes a separation bearing to compress the thrust of a clutch disc and cause that the crankshaft is axially shifted, the gap between a crankshaft balance weight and the stop push bar of a main bearing of the crankshaft box is ensured by the first curved surface; the gap between the shaft shoulder of the spindle of the crankshaft and the crankshaft box is ensured by the second curved surfaces, so that the collision between the crankshaft and the crankshaft box is avoided, the irregular sound of the motor during idle running is solved, the abrasion of the crankshaft and the crankshaft box is relived, the durability of the crankshaft box is improved, and the service life of the crankshaft box is prolonged.

Description

technical field [0001] The invention relates to automobile engine technology, in particular to a crankcase and an engine. Background technique [0002] Engine at least comprises cylinder block 10 and the crankshaft 3 that is located in cylinder block 10, and crankcase 1 is a part of cylinder block 10, is used for assembling crankshaft 3, and crankshaft 3 is made up of main shaft 30 and the balance weight 31 that is located on main shaft 30 and main shaft The journal shoulders 32, the main journal shoulders 32 are located at both ends of the crankshaft 30, the balance weight 31 is located in the middle of the main shaft 30, that is, between the main journal shoulders 32, and the inner wall of the crankcase 1 has multiple pairs of radial protrusions, each pair of radial protrusions The upper part is used to install the bearing cap 40, and the main shaft 30 is installed between the balance weight 31 and the main shaft 30 between the balance weight 31 and the main journal should...

AI Technical Summary

Problems solved by technology

[0002] Engine at least comprises cylinder block 10 and the crankshaft 3 that is located in cylinder block 10, and crankcase 1 is a part of cylinder block 10, is used for assembling crankshaft 3, and crankshaft 3 is made up of main shaft 30 and the balance weight 31 that is located on main shaft 30 and main shaft The journal shoulders 32, the main journal shoulders 32 are located at both ends of the crankshaft 30, the balance weight 31 is located in the middle of the main shaft 30, that is, between the main journal shoulders 32, and the inner wall of the crankcase 1 has multiple pairs of radial protrusions, each pair of radial protrusions The upper part is used to install the bearing cap 40, and the main shaft 30 is installed between the balance weight 31 and the main shaft 30 between the balance weight 31 and the main journal shoulder 32, and the main bush 50 is fixed on the crankcase 1 through the bearing cap 40 , where the radial projections used to install the main bearing bush between the balance weights are the main bearing thrust block 11, used to install the main bearing bush 50 between the balance weight 31 and the main journal shoulder 32, and used to install the two main journal shafts The radial protrusions of the main bearing bush 50 between the shoulders 32 are auxiliary bearing thrust blocks 12, such as figure 1 As shown, due to the inertia of the car, when the clutch is stepped on, the shift fork pushes the release bearing to compress the thrust of the clutch pressure plate, which will cause the crankshaft to move axially, causing the crankshaft to collide with the crankcase, and there will be a dull "when the engine is idling. , when the "sound" sound, rapid acceleration is more obvious, which will cause unnecessary wear and tear on the engine crankshaft and crankcase. Usually, a thrust plate 60 is installed between the crankshaft balance weight 31 and the crankcase main bearing thrust block 11 to limit the crankshaft 3 axial movement

[0003] However, as the service time increases, the thrust plate 60 will be worn, causing the crankshaft 3 to move axially, see Figure 2-6 , figure 2 When the thrust plate is not worn, the enlarged structure diagram between the crankshaft main journal shoulder 32 and the side of the auxiliary bearing thrust stop 12, the position of the dotted line is the position of the side of the auxiliary bearing thrust stop 12 when the crankshaft moves; image 3 It is an enlarged schematic diagram of the structure between the crankshaft counterweight 31 and the side of the thrust block 11 of the main bearing, and the dotted line position is the position of the side of the thrust block 11 of the main bearing when the crankshaft moves; Figure 5 When the thrust plate 60 is severely worn, the enlarged structural diagram between the crankshaft main journal shoulder 32 and the side of the auxiliary bearing thrust block 12, the position of the dotted line is the position of the side of the main bearing thrust block 11 when the crankshaft moves; Image 6 It is an enlarged schematic diagram of the structure between the crankshaft balance weight 31 and the side of the main bearing thrust block 11, and the position of the dotted line is the position of the side of the main bearing thrust block 11 when the crankshaft moves; , the crankshaft balance weight 31 and the main journal shoulder 32 will collide with the crankcase 1 when they move axially, and the wear of the thrust plate 60 will become more serious

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